阅读说明：本技术 一种温度检测装置、功率模块及其温度检测方法 (Temperature detection device, power module and temperature detection method thereof ) 是由 黎俊宇 张永刚 荣梦杰 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种温度检测装置、功率模块及其温度检测方法,该装置包括：温度检测单元、温度补偿单元和温度确定单元；其中,温度检测单元,用于检测功率模块的温度,得到温度检测值；温度补偿单元,用于确定功率模块的温度补偿值；温度确定单元,用于根据功率模块的温度检测值和功率模块的温度补偿值,确定功率模块的预估温度值。本发明的方案,可以解决采样温度与实际温度之间存在偏差的问题,达到功率模块的温度检测的准确性的效果。(The invention discloses a temperature detection device, a power module and a temperature detection method thereof, wherein the device comprises: the temperature detection unit, the temperature compensation unit and the temperature determination unit; the temperature detection unit is used for detecting the temperature of the power module to obtain a temperature detection value; the temperature compensation unit is used for determining a temperature compensation value of the power module; and the temperature determining unit is used for determining the estimated temperature value of the power module according to the temperature detection value of the power module and the temperature compensation value of the power module. The scheme of the invention can solve the problem of deviation between the sampling temperature and the actual temperature, and achieves the effect of accuracy of temperature detection of the power module.)

1. A temperature detection device, comprising: the temperature detection unit, the temperature compensation unit and the temperature determination unit; wherein the content of the first and second substances,

the temperature detection unit is used for detecting the temperature of the power module to obtain a temperature detection value;

the temperature compensation unit is used for determining a temperature compensation value of the power module;

and the temperature determining unit is used for determining the estimated temperature value of the power module according to the temperature detection value of the power module and the temperature compensation value of the power module.

2. The temperature detection apparatus according to claim 1, wherein the temperature detection unit includes: a temperature sensing bulb;

and the temperature sensing bulb is used for sampling the temperature of the copper foil connected with the power module and taking the sampled temperature of the copper foil as the temperature detection value of the power module.

3. The temperature detection apparatus according to claim 1 or 2, wherein the temperature compensation unit determines a temperature compensation value of the power module, including:

determining a time difference value between two adjacent detection moments, and determining a temperature difference value between two temperature detection values detected at the two adjacent detection moments;

determining the ratio of the temperature difference between two temperature detection values detected at two adjacent detection moments to the time difference between two adjacent detection moments as the time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection moments;

and determining the temperature compensation value of the power module by multiplying the time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection moments and the time difference between the two adjacent detection moments.

4. The temperature detection device according to claim 1 or 2, wherein the temperature determination unit determines the estimated temperature value of the power module, and comprises:

and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

5. A power module, comprising: a temperature sensing device as claimed in any one of claims 1 to 4.

6. A method for detecting the temperature of a power module according to claim 5, comprising:

detecting the temperature of the power module through a temperature detection unit to obtain a temperature detection value;

determining a temperature compensation value of the power module through a temperature compensation unit;

and determining the estimated temperature value of the power module through the temperature determination unit according to the temperature detection value of the power module and the temperature compensation value of the power module.

7. The temperature detection method according to claim 6, wherein detecting the temperature of the power module by the temperature detection unit includes:

and sampling the temperature of the copper foil connected with the power module through the temperature sensing bulb, and taking the sampled temperature of the copper foil as a temperature detection value of the power module.

8. The temperature detection method according to claim 6 or 7, wherein determining the temperature compensation value of the power module through the temperature compensation unit comprises:

determining a time difference value between two adjacent detection moments, and determining a temperature difference value between two temperature detection values detected at the two adjacent detection moments;

determining the ratio of the temperature difference between two temperature detection values detected at two adjacent detection moments to the time difference between two adjacent detection moments as the time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection moments;

and determining the temperature compensation value of the power module by multiplying the time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection moments and the time difference between the two adjacent detection moments.

9. The temperature detection method according to claim 6 or 7, wherein determining the estimated temperature value of the power module by the temperature determination unit comprises:

and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

Technical Field

The invention belongs to the technical field of electronic circuits, and particularly relates to a temperature detection device, a power module and a temperature detection method thereof, in particular to a real-time temperature monitoring system of the power module, the power module and a temperature detection method thereof.

Background

With the increasing popularization of electronic circuits, communication networks and other technologies, printed circuit boards (PCB for short) have been widely used in the field of electronic circuits, for example, household electrical appliances, computers, medical devices, various electronic measuring instruments and the like need to be applied to the PCB.

However, the high performance and low cost of the household appliance require, and new challenges are provided for the design, such as selection of components and parts of the controller, which have obvious contradiction between specification and price, and an optimal scheme needs to be realized in an effective manner. For example: in some printed circuit board temperature detection protection technologies, a certain delay and deviation exist between the temperature sampled on the printed circuit board and the temperature of the actual power module.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The present invention is directed to provide a temperature detection apparatus, a power module and a temperature detection method thereof, so as to solve the problem of deviation between a sampling temperature and an actual temperature, and achieve the effect of accuracy of temperature detection of the power module.

The present invention provides a temperature detection device, including: the temperature detection unit, the temperature compensation unit and the temperature determination unit; the temperature detection unit is used for detecting the temperature of the power module to obtain a temperature detection value; the temperature compensation unit is used for determining a temperature compensation value of the power module; and the temperature determining unit is used for determining the estimated temperature value of the power module according to the temperature detection value of the power module and the temperature compensation value of the power module.

Optionally, the temperature detection unit includes: a temperature sensing bulb; and the temperature sensing bulb is used for sampling the temperature of the copper foil connected with the power module and taking the sampled temperature of the copper foil as the temperature detection value of the power module.

Optionally, the temperature compensation unit determines a temperature compensation value of the power module, including: determining a time difference value between two adjacent detection moments, and determining a temperature difference value between two temperature detection values detected at the two adjacent detection moments; determining the ratio of the temperature difference between two temperature detection values detected at two adjacent detection moments to the time difference between two adjacent detection moments as the time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection moments; and determining the temperature compensation value of the power module by multiplying the time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection moments and the time difference between the two adjacent detection moments.

Optionally, the determining the estimated temperature value of the power module by the temperature determining unit includes: and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

In accordance with the above apparatus, a further aspect of the present invention provides a power module, comprising: the temperature detection device described above.

In matching with the power module, another aspect of the present invention provides a method for detecting a temperature of a power module, including: detecting the temperature of the power module through a temperature detection unit to obtain a temperature detection value; determining a temperature compensation value of the power module through a temperature compensation unit; and determining the estimated temperature value of the power module through the temperature determination unit according to the temperature detection value of the power module and the temperature compensation value of the power module.

Optionally, detecting the temperature of the power module by a temperature detection unit includes: and sampling the temperature of the copper foil connected with the power module through the temperature sensing bulb, and taking the sampled temperature of the copper foil as a temperature detection value of the power module.

Optionally, determining a temperature compensation value of the power module by a temperature compensation unit includes: determining a time difference value between two adjacent detection moments, and determining a temperature difference value between two temperature detection values detected at the two adjacent detection moments; determining the ratio of the temperature difference between two temperature detection values detected at two adjacent detection moments to the time difference between two adjacent detection moments as the time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection moments; and determining the temperature compensation value of the power module by multiplying the time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection moments and the time difference between the two adjacent detection moments.

Optionally, determining an estimated temperature value of the power module by the temperature determination unit includes: and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

According to the scheme of the invention, the temperature compensation is added, so that the detection temperature of the power module is closer to the actual temperature of the power module, and the temperature detection precision and sensitivity can be improved.

Furthermore, according to the scheme of the invention, the real-time temperature of the power module is estimated and the change trend of the temperature is predicted by fully utilizing the slope judgment of the temperature curve of the power module, so that the detected temperature is closer to the actual temperature of the power module, and the detection accuracy of the temperature of the power module is improved.

Furthermore, according to the scheme of the invention, the detection temperature compensation mechanism is added, so that the detection temperature is closer to the actual temperature of the power module, the problem of burning caused by overhigh module temperature due to failure of temperature detection is prevented, and the reliability of over-temperature protection of the power module is improved.

Therefore, according to the scheme of the invention, the temperature compensation is added, so that the detected temperature of the power module is closer to the actual temperature of the power module, the problem of deviation between the sampling temperature and the actual temperature is solved, and the effect of accuracy of temperature detection of the power module is achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic structural diagram of a temperature detecting device according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a layout of an inter-board temperature sensing package according to an embodiment of the power module of the invention;

FIG. 3 is a schematic diagram of a temperature-time curve of a thermal bulb of an embodiment of a power module of the invention, wherein (a) and (b) are different conditions of temperature variation within the same time period;

FIG. 4 is a schematic flow chart illustrating a temperature detecting method according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating an embodiment of determining a temperature compensation value of a power module by a temperature compensation unit in the method of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, there is provided a temperature detection device. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The temperature detection device may include: the temperature detection unit, the temperature compensation unit and the temperature determination unit. The temperature detecting unit may be a thermistor.

Specifically, the temperature detection unit may be configured to detect a temperature of the power module, and obtain a temperature detection value.

Optionally, the temperature detection unit may include: a thermal bulb. The temperature sensing bulb can be used for sampling the temperature of the copper foil connected with the power module, and the temperature of the copper foil obtained through sampling is used as the temperature detection value of the power module. For example: the temperature sampling of the temperature sensing bulb between the boards of the PCB is realized by the temperature transmission of the copper foil connected with the power module.

Therefore, the copper foil connected with the power module is used for temperature transmission, so that the copper foil is thin and has good heat conductivity, and the speed of temperature penetration can be improved.

In particular, the temperature compensation unit may be configured to determine a temperature compensation value for the power module.

Optionally, the determining, by the temperature compensation unit, the temperature compensation value of the power module may include: determining a time difference value between two adjacent detection moments, and determining a temperature difference value between two temperature detection values detected at the two adjacent detection moments; determining the ratio of the temperature difference between two temperature detection values detected at two adjacent detection moments to the time difference between two adjacent detection moments as the time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection moments; and determining the temperature compensation value of the power module by multiplying the time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection moments and the time difference between the two adjacent detection moments.

For example: if a lag Δ T is needed when the temperature value Temp1 of the power module at the time T1 is transmitted to the actual temperature sensing bulb, that is, the temperature value Temp2 of the temperature sensing bulb at the time T2 is the temperature value of the power module at the time T1, the temperature value Temp1 of the temperature sensing bulb at the time T1 is the temperature value of the power module at the previous time, let Δ T be T2-T1, let Δ Temp be Temp2-Temp1, and so on, let the temperature-time change rate be K, then let K be Δ Temp/Δ T, and use the K value to estimate the temperature of the current power module.

Therefore, the temperature compensation value of the power module is determined based on the time difference value between two adjacent detection moments and the temperature difference value between two temperature detection values detected at two adjacent detection moments, and then the estimated temperature value of the power module can be compensated, so that the estimated temperature value is more accurate.

Specifically, the temperature determining unit may be configured to determine an estimated temperature value of the power module according to a temperature detection value of the power module and a temperature compensation value of the power module.

For example: the utility model provides a power module temperature real-time monitoring system, through increasing temperature compensation, makes the detection temperature of power module more be close to the actual temperature of power module, can improve temperature detection precision, sensitivity, prevents that the temperature detection from becoming invalid and leading to the problem that the module high temperature arouses to burn out, promotes the accurate nature and the promptness of the temperature detection of power module.

Therefore, by adding a thermistor temperature compensation mechanism, the detection temperature is closer to the actual temperature of the power module in a stable state, and the accuracy of temperature detection of the power module can be improved.

Optionally, the determining the estimated temperature value of the power module by the temperature determining unit may include: and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

For example: and predicting the temperature value of the power module at the next moment according to the temperature time change rate K at the last moment, and predicting the temperature value Temp3 of the power module at the next moment T3, such as the current moment T2 power module temperature value Temp 2. From K ═ Δ Temp/Δ T, Temp3-Temp2 ═ K × Δ T, i.e., Temp3 ═ K × Δ T + Temp 2. And according to the estimated temperatures of the power module at the current moment and the next moment, the temperature of the power module is taken as one of frequency control conditions of the power module, and the temperature of the power module is ensured to work within an allowable range. Therefore, the problems of deviation and delay of the temperature of the power module and the sampling temperature of the temperature sensing bulb can be solved from two aspects of temperature compensation and temperature estimation, the slope of the temperature curve of the power module can be fully utilized for judgment, the real-time temperature of the power module can be estimated, and the change trend of the temperature can be predicted; the problem that the temperature rise of the power module exceeds the standard due to temperature deviation and transmission lag is further avoided; of course, interference model selection can be avoided, and material cost is reduced.

Therefore, the temperature detection value of the power module at the current moment is compensated based on the temperature detection value detected at the last detection time to obtain the estimated temperature value of the power module at the current moment, so that the estimated temperature value is closer to the real temperature, and the accuracy of determining the estimated temperature value of the power module is improved.

Through a large number of tests, the technical scheme of the invention is adopted, and the detection temperature of the power module is closer to the actual temperature of the power module by increasing the temperature compensation, so that the temperature detection precision and sensitivity can be improved.

According to the embodiment of the invention, a power module corresponding to the temperature detection device is also provided. The power module may include: the temperature detection device described above.

In an optional embodiment, at least in order to solve the problem of over-temperature protection failure caused by deviation and hysteresis of the temperature of the printed circuit board and the actual temperature of the module, the scheme of the invention provides a real-time temperature monitoring system for the power module, which can improve the accuracy and sensitivity of temperature detection by increasing temperature compensation to enable the detected temperature of the power module to be closer to the actual temperature of the power module, thereby preventing the problem of burnout caused by over-high temperature of the module due to failure of temperature detection. That is, the detected temperature is brought closer to the actual temperature of the power module by adding a detected temperature compensation mechanism.

Alternatively, the slope judgment of the temperature curve of the power module can be fully utilized, the real-time temperature of the power module can be estimated, and the change trend of the temperature can be predicted.

Generally, in the selection of the power module, a large margin is left, for example, the use temperature range is subject to the condition that the temperature does not exceed a certain limit value under the condition of maximum load, and the empirical mode selection leads to a large selection specification of the power module, and the actual use condition is not considered. According to the scheme, the problems of deviation and delay of the temperature of the power module and the sampling temperature of the temperature sensing bulb are solved from the two aspects of temperature compensation and temperature estimation, and the problem of exceeding the standard of the temperature rise of the power module caused by temperature deviation and transmission delay is further avoided; of course, interference model selection can be avoided, and material cost is reduced.

FIG. 2 is a schematic diagram of the arrangement of the thermal bulbs between plates.

As shown in fig. 2, the inter-board thermal bulb is placed in a certain manner near the power module for detecting the temperature of the power module.

For example: the arrangement mode of the temperature sensing bags between the plates can be large copper foils close to the power module, such as ground network copper foils, the area is large, the heat conducting performance is good, and the error of temperature sampling is reduced.

As shown in fig. 2, the power module temperature real-time monitoring system may be a minimum system mainly composed of a main chip, a power module, and a temperature sampling circuit (e.g., a thermistor).

The main chip can control the working frequency of the power module according to the system input quantity. The thermistor can output dynamic voltage signals to the main chip according to the temperature change of the power module, the main chip converts the voltage value of the thermistor into a temperature value, and the temperature value of the power module is obtained through serial conversion. However, in practice, the power module and the thermistor have a certain distance therebetween, and the temperature therebetween varies to some extent. Therefore, the scheme of the invention is closer to the actual power module temperature in a stable state by adding a thermistor temperature compensation mechanism.

For example: when the voltage value of the thermistor is converted into the temperature value, the current temperature value can be converted by looking up a table according to the voltage value sampled by the AD port of the chip, and the temperature value corresponding to the AD value can be obtained by looking up the table. The series of operations can be temperature compensation operations, and the sampled temperature value has a certain difference with the temperature value of the actual module, needs to be compensated and is closer to the temperature value of the actual module; in addition, advanced estimation is required to be added, the temperature value sampled at the current moment is actually the temperature value at the last moment of the power module, and the current temperature value of the power module needs to be estimated through estimation, so that the power module is better protected.

Fig. 3 is a schematic diagram of a temperature-time curve of a thermal bulb, which can show a temperature-time curve of a temperature-detecting thermal bulb of a power module.

As shown in FIG. 3, line L1 is the temperature-time curve of the actual thermal bulb, line L2 is the temperature-time curve of the power module, and the slope represents the temperature change rate, and the boxes in L1 and L2 represent the corresponding temperature values at time T1/T2.

When the temperature is T0, the actual temperature of the thermal bulb is Troom, the temperature of the power module is Temp0, the temperature difference between the thermal bulb and the power module is Temp0-Troom, namely the temperature value sampled by the thermal bulb is added with the delta T complement and used as the temperature of the power module, so that the temperature is closer to the actual temperature of the power module, and the temperature protection failure caused by overlarge temperature deviation is avoided.

Because the temperature of the temperature sensing bulb between the plates is sampled by transferring the temperature through the copper foil connected with the power module, a certain time lag exists between the temperature transfer, and the problem that the module is burnt down due to the fact that the temperature of the power module and the temperature of the actual temperature sensing bulb are transferred too slowly is solved. According to the scheme of the invention, the temperature of the current power module is estimated and the temperature change trend is predicted through an increased temperature time slope judgment mode.

As shown in fig. 2, when the temperature value Temp1 of the power module at time T1 is transmitted to the actual temperature sensing bulb, a lag Δ T is required, that is, the temperature value Temp2 of the temperature sensing bulb at time T2 is the temperature value of the power module at time T1, the temperature value Temp1 of the temperature sensing bulb at time T1 is the temperature value of the power module at the previous time, where Δ T is T2-T1, Δ Temp is Temp2-Temp1, and so on, if the temperature-time change rate is K, K is Δ Temp/Δ T, and the temperature of the current power module is estimated using the K value.

Similarly, according to the time rate of change K of the temperature at the previous moment, the temperature value of the power module at the next moment is predicted, and for example, the temperature value Temp2 of the power module at the current moment T2, the temperature value Temp3 of the power module at the next moment T3 is predicted.

From K ═ Δ Temp/Δ T, Temp3-Temp2 ═ K × Δ T, i.e., Temp3 ═ K × Δ T + Temp 2. The temperature compensation value is compensated according to the increase of the actual system, and the compensation temperature values are different according to different PCB layouts.

And according to the estimated temperatures of the power module at the current moment and the next moment, the temperature of the power module is taken as one of frequency control conditions of the power module, and the temperature of the power module is ensured to work within an allowable range.

Since the processing and functions implemented by the power module of this embodiment substantially correspond to the embodiments, principles, and examples of the apparatus shown in fig. 1, reference may be made to the related descriptions in the foregoing embodiments without details in the description of this embodiment.

Through a large number of tests, the technical scheme of the invention is adopted, and the real-time temperature of the power module and the change trend of the predicted temperature are estimated by fully utilizing the slope judgment of the temperature curve of the power module, so that the detected temperature is closer to the actual temperature of the power module, and the detection accuracy of the temperature of the power module is improved.

According to an embodiment of the present invention, a method for detecting a temperature of a power module corresponding to the power module is also provided, as shown in fig. 4, which is a schematic flow chart of an embodiment of the method of the present invention. The temperature detection method of the power module can comprise the following steps: step S110 to step S130.

At step S110, the temperature of the power module is detected by the temperature detection unit, resulting in a temperature detection value.

Alternatively, the detecting the temperature of the power module by the temperature detecting unit in step S110 may include: and sampling the temperature of the copper foil connected with the power module through the temperature sensing bulb, and taking the sampled temperature of the copper foil as a temperature detection value of the power module. For example: the temperature sampling of the temperature sensing bulb between the boards of the PCB is realized by the temperature transmission of the copper foil connected with the power module.

Therefore, the copper foil connected with the power module is used for temperature transmission, so that the copper foil is thin and has good heat conductivity, and the speed of temperature penetration can be improved.

At step S120, a temperature compensation value of the power module is determined by the temperature compensation unit.

Optionally, a specific process of determining the temperature compensation value of the power module through the temperature compensation unit in step S120 may be further described with reference to a flowchart of an embodiment of a method for analyzing a wavelet packet in the method shown in fig. 5, where the specific process may include: step S210 to step S230.

In step S210, a time difference between two adjacent detection moments is determined, and a temperature difference between two temperature detection values detected at two adjacent detection moments is determined.

In step S220, a ratio between a temperature difference between two temperature detection values detected at two adjacent detection times and a time difference between two adjacent detection times is determined as a time-dependent change rate of the temperature between the two temperature detection values detected at the two adjacent detection times.

In step S230, a product of a time-dependent change rate of the temperature between two temperature detection values detected at two adjacent detection times and a time difference between the two adjacent detection times is used to determine a temperature compensation value of the power module.

For example: if a lag Δ T is needed when the temperature value Temp1 of the power module at the time T1 is transmitted to the actual temperature sensing bulb, that is, the temperature value Temp2 of the temperature sensing bulb at the time T2 is the temperature value of the power module at the time T1, the temperature value Temp1 of the temperature sensing bulb at the time T1 is the temperature value of the power module at the previous time, let Δ T be T2-T1, let Δ Temp be Temp2-Temp1, and so on, let the temperature-time change rate be K, then let K be Δ Temp/Δ T, and use the K value to estimate the temperature of the current power module.

Therefore, the temperature compensation value of the power module is determined based on the time difference value between two adjacent detection moments and the temperature difference value between two temperature detection values detected at two adjacent detection moments, and then the estimated temperature value of the power module can be compensated, so that the estimated temperature value is more accurate. At step S130, an estimated temperature value of the power module is determined according to the temperature detection value of the power module and the temperature compensation value of the power module through the temperature determination unit.

For example: the utility model provides a power module temperature real-time monitoring system, through increasing temperature compensation, makes the detection temperature of power module more be close to the actual temperature of power module, can improve temperature detection precision, sensitivity, prevents that the temperature detection from becoming invalid and leading to the problem that the module high temperature arouses to burn out, promotes the accurate nature and the promptness of the temperature detection of power module.

Therefore, by adding a thermistor temperature compensation mechanism, the detection temperature is closer to the actual temperature of the power module in a stable state, and the accuracy of temperature detection of the power module can be improved.

Optionally, the determining the estimated temperature value of the power module by the temperature determining unit in step S130 may include: and taking the sum of the temperature detection value detected at the last detection moment and the temperature compensation value as the estimated temperature value of the power module at the current detection moment.

For example: and predicting the temperature value of the power module at the next moment according to the temperature time change rate K at the last moment, and predicting the temperature value Temp3 of the power module at the next moment T3, such as the current moment T2 power module temperature value Temp 2. From K ═ Δ Temp/Δ T, Temp3-Temp2 ═ K × Δ T, i.e., Temp3 ═ K × Δ T + Temp 2. And according to the estimated temperatures of the power module at the current moment and the next moment, the temperature of the power module is taken as one of frequency control conditions of the power module, and the temperature of the power module is ensured to work within an allowable range. Therefore, the problems of deviation and delay of the temperature of the power module and the sampling temperature of the temperature sensing bulb can be solved from two aspects of temperature compensation and temperature estimation, the slope of the temperature curve of the power module can be fully utilized for judgment, the real-time temperature of the power module can be estimated, and the change trend of the temperature can be predicted; the problem that the temperature rise of the power module exceeds the standard due to temperature deviation and transmission lag is further avoided; of course, interference model selection can be avoided, and material cost is reduced.

Therefore, the temperature detection value of the power module at the current moment is compensated based on the temperature detection value detected at the last detection time to obtain the estimated temperature value of the power module at the current moment, so that the estimated temperature value is closer to the real temperature, and the accuracy of determining the estimated temperature value of the power module is improved.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles, and examples of the power module, reference may be made to the related descriptions in the embodiments without being detailed in the description of this embodiment, which is not described herein again.

Through a large amount of tests, the technical scheme of the embodiment is adopted, and a detection temperature compensation mechanism is added, so that the detection temperature is closer to the actual temperature of the power module, the problem that the module is burnt due to overhigh temperature caused by failure of temperature detection is prevented, and the reliability of over-temperature protection of the power module is improved.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.